The Disability Discrimination Act 1995 is a UK parliamentary act made a law against the discrimination of anyone with respect to his or her disabilities in relation to employment, the provision of goods and services, education and transport. In fact, it is a civil rights law.
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Here's an article from DisabilityNow.org --
http://www.disabilitynow.org.uk/latest-news2/protest-over-hospital-transport-201cdiscrimination201dProtest over hospital transport “discrimination”John Pring
St Thomas Protesters are set to demonstrate outside a major London hospital over what they say are its discriminatory policies on patient transport services.
The campaigners say patients who use London’s Taxicard transport service or have a car of their own – even if they cannot drive it – are barred from using the patient transport service run by Guy’s and St Thomas’ NHS Foundation Trust in south London.
Transport for All – the accessible transport-users charity, which is organising the protest – said the hospital’s policies put disabled people “under economic house arrest”.
One patient, Rose, who has cancer and needs to visit the hospital four to eight times a month for treatment, has been refused patient transport and was told instead that she had to use her 12 Taxicard journeys a month to travel to and from the hospital.
She has no spare money to pay for journeys to see friends, or go to the supermarket, church, library or cinema.
She said: “The hospital has put me under house arrest. I really miss going out to see my friends.”
Faryal Velmi, co-director of Transport for All, said: “It is forcing disabled people to use their Taxicard on hospital appointments rather than what it is meant for, to live independent lives and have a social life.
“It is making disabled people completely dependent on friends and relatives.”
The protest is due to take place outside St Thomas’ Hospital during its open day tomorrow (Saturday, 21 June), from 11am.
The hospital trust said it provides 170,000 free, non-emergency patient transport journeys every year.
A trust spokeswoman said patient transport was provided “on the basis of clinical and mobility needs” and access to other means of transport, and not on a patient’s ability to pay.
She said the trust’s eligibility critieria for non-emergency patient transport exceeds Department of Health guidelines.
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That led me to this
Eligibility criteria for patient transport services (PTS) --
http://www.dh.gov.uk/en/Publicationsandstatistics/Publications/PublicationsPolicyAndGuidance/DH_078373Not sure if that helps, but might be useful to know the criteria before sending your letter.